| Author |
Message |
david anderson (Davidanderson)
Registered Member
Username: Davidanderson
Post Number: 223
Registered: 2-2004
Posted From: 69.153.78.154
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, December 05, 2007 - 5:33 pm: | |
What does "common rail" mean when diesel guys talk about a fuel injection system on an engine? I've been lurking the wvo/svo fuel bulletin boards and that is mentioned from time to time.
David |
Sammy (Sammy)
Registered Member
Username: Sammy
Post Number: 79
Registered: 8-2005
Posted From: 68.237.219.157
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, December 05, 2007 - 6:23 pm: | |
Might be referring to a fuel system that has injectors, not nozzles. Fuel is always flowing thru a common fuel galley,or rail. - common to all injectors all the time.
Nozzle type has an injection pump that pressurizes and decides which cylinder to send the fuel to. |
Jim Wilke (Jim Bob) (Pd41044039)
Registered Member
Username: Pd41044039
Post Number: 225
Registered: 2-2001
Posted From: 71.31.53.189
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, December 05, 2007 - 7:39 pm: | |
David,
"Common rail" refers to a fuel injection system where the fuel injectors are opened & closed by the engine computer and are supplied with fuel at a very high pressure. While a "traditional" fuel injection system would develop around 3,000 PSI, common rail systems develop around 25,000 PSI. These common rail components are designed with much closer tolerances and therefore are MUCH more suseptible to damage from water and other contaminants in the fuel AND reduced lubricity as found in Ultra Low Sulphur Diesel fuel. While our old DD 2 stroke "traditional" low pressure injectors can tolerate WVO fairly well, H.P.C.R. fuel systems can be destroyed very easily. AND, the injectors for HPCR are around $500 each. A lot of injector shops can't rebuild them and you wouldn't get credit for siezed up cores.
Kinda makes that old 2 stroke sound even sweeter, huh?
Jim-Bob |
Brian Elfert (Belfert)
Registered Member
Username: Belfert
Post Number: 49
Registered: 7-2006
Posted From: 209.98.146.235
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, December 05, 2007 - 10:06 pm: | |
I find it hard to believe that ULSD would hurt common rail engines as most new diesel engines in cars and pickups are common rail now. |
david anderson (Davidanderson)
Registered Member
Username: Davidanderson
Post Number: 224
Registered: 2-2004
Posted From: 69.153.78.154
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, December 05, 2007 - 10:22 pm: | |
Thank you, good lesson and good stuff to know |
David (Davidinwilmnc)
Registered Member
Username: Davidinwilmnc
Post Number: 209
Registered: 7-2005
Posted From: 152.20.216.103
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, December 06, 2007 - 11:08 am: | |
"I find it hard to believe that ULSD would hurt common rail engines as most new diesel engines in cars and pickups are common rail now."
Brian,
I seem to recall reading a warning on a Diesel pump at a local gas station about using ULSD in 2006 or newer vehicles. I may be mistaken as to the year, but there was a warning. I'll try to stop by that station and look for it.
David |
Brian Elfert (Belfert)
Registered Member
Username: Belfert
Post Number: 50
Registered: 7-2006
Posted From: 132.148.80.215
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, December 06, 2007 - 4:24 pm: | |
ULSD is required for all 2007 year diesel engines. The diesel particulate filters will get plugged if run with LSD.
You probably saw a pump with the LSD 500 PPM diesel warning sticker saying not to use it in 2007 year diesel engines. Some pumps still have that sticker even though they most likely are pumping ULSD. |
Jim Wilke (Jim Bob) (Pd41044039)
Registered Member
Username: Pd41044039
Post Number: 229
Registered: 2-2001
Posted From: 72.242.136.203
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, December 06, 2007 - 10:14 pm: | |
Brian, One of the things sulphur does in diesel fuel is act as a lubricant. Don't "find it hard to believe". Go talk to at least 2 or 3 diesel injection repair shops. Do some Internet research. My information comes from these sources and internal Engineering Dept. discussions on what our company and our vendors can do to make our products live a decent life span. (This means not fail under warranty!)
ULSD is a lot like Jet fuel. During the first Desert war, our military decided that they were going to insist that all engine powered equipment had to be able to run on jet fuel to simplify the military's fuel procurement and logistics. The results were that those low pressure "traditional" diesels experienced huge failure rates because jet is "dry" (extremely low lubricity). It is not Diesel fuel.
"Some" diesel fuel distributors (not refineries) have started adding lubricity compounds to their fuel but the questions arise : which ones, how much & is it adequate?
Remember, niether the EPA nor the refineries really care about engine longevity. Actually, the EPA would like to see engines tossed out about every 5 years so that their mandates take effect faster. Refineries only care about profits & keeping EPA away. Engine & vehicle manufacturers are really only worried about keeping their machines running until the warranty period is over. After that they WANT to sell parts & soon have the vehicle go away so you buy a new one. (If you doubt this ask yourself why they removed all of the grease fittings from everything & now you can't even service your front wheel bearings (2005 F150 & others have sealed, non tapered bearings!)
Jim-Bob |